Little Piggy Tracker (Raspberry Pi Edition) can now run smoothly on the Raspberry Pi 2 with Raspbian Stretch! This page has all the instructions on how to do this successfully.
Now you can successfully run LGPT on Raspbian Stretch with a Raspberry Pi 2.
NOTE: This method no longer works. Check out djdiskmachine on Github and use his builds of LGPT to compose epic tunes on more modern handheld machines.